the ntsb is still working on that at their materials lab in d.c. where they disassembled the lithion ion battery that caused the fire in boston two weeks ago. so far we've only received three updates on their investigation and it sounds like they're using the process of elimination to find out what's wrong because the latest thing they've crossed off their list of possible problems is excess voltage. in a statement today, the ntsb says, and this is a quote, examination of the flight recorder data from the jalb 787 airplane indicates that the apu battery did not exceed its designed voltage of 32 volts and boeing said they are not going to speculate about what's wrong with their batteries until the faa finishes its investigation. jon, you see the batteries there. >> yeah. so how much longer will the airplanes stay grounded? >> reporter: there's no time table for that right now officially, but governments around the world told airlines using these enormous aircraft, these enormous 787s to keep them grounded to make sure these batteries don't cause any